Baker&#39;s oven.



L. F. A. DRUET & G. LARRABURU.

BAKER'S OVEN.

APPLICATION FILED 1111111.29, 1913.

Patented D90. 1, 1914.

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L. P. A. DRUET a G. LARRABURU.

BAKRS OVEN.

APPLICATION FILED MAR.29.1913.

Patented Dec. 1, 1914.

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STARS LOUIS FELDNAND ALPHONSE DRUET AND GEORGES LAR-RABURU. F IARIS, FRANCE; SAID DRUET ASSIGNOR TO SAID LARRABURU.

BAKERS OVEN.

rammed Dec. i, 1914.

Application led March 29, 1913. Serial No. 757,618.

. ALPHONSE RUET and GEORGES LARRAnUnU,

citizens of the French Republic, both residing at 3ft ARue Vieille du Temple, Paris, in the Department of Seine, France, have invented new and useful Improvements in Bakers Ovens, of which the following is a specification. 10

The present invention relates to certain improvements in that type of bakers oven, the door of which, constructed as an endless band extends throughout the entire length of the oven and 'moves over rollers so as to carry the bread from the entrance to the exit or the oven, and returns beneath the Voven to the starting point.

The present invention is designed to rovide 'improvements in the method of hing- -ing the sole plates forming the traveling floor of the oven, and also consists in corresponding improvements in the propelling mechanism adapted to coperate with the tloor.

The object of these improvements is to insure that the floor travels 'very smoothly and regularly with a minimumof friction, and that the tension in the floor during operation oi' the propelling mechanism remains the same, in spite of variations in temperature.

The ioor is composed ofelements of firel resisting brick7 supported by U irons shaped into connecting pieces and attached together by a hinge in order to engage with the propelling drums. Gne of these drums is supported by counterbalanced movable bearings for the purpose of automatically regulating the tension of the floor and permitting it to expand or contract Without injury.

The precise constructional details which form our present invention are hereinafter described with reference to the accompanying drawings, inwhich- Figure 1 shows a longitudinal section of a bakers oven with moving floor constructed according to the present invention. Fig. 2 shows a detail View illustrating in elevation a part of the front Wall of the oven and in section the mounting of the rear drum of the floor. Figs. 3 and 4 shoW details'in longitudinal elevation and transverse section of a chain with knobs serving as the traveling chain for the Hoor. Fig. 5 shows a transverse section of an endof the floor. Figs. il and 7 show details of the arrangement. ot' the movable bearing with a balancing counteriveight insuring the tension ofi the floor. Figs. S and 9 show the construction for the motion of a protective plate on studs with differential motion. Figs. l0, 11 and 12 show details in plan and rsection respectively on thc lines A-B and C-D oi a bar of U shape curved at its ends to hold the ire resisting bricks and :forming an element of the door.

The moving floor is arranged as an ond less platform which travels l'rom the .front to the rear of the oven upon the drums TQS, supported by the respective shafts 9, l0 Which turn in ball bearings l1, i2 the chains of which are ii'xcd to the corresponding plates 1, 2. An outside mechanism comprising a wheel 13 and worm 11i insures the motion of the floor continuously or intermittently at the desired speed which is adjusted so that the duration of the passage of the bread from the entrance to the exit corresponds to the time for baking. The Iioor proper is formed oi elements hinged together. cach consisting of a support 15 of U-shaped irons in which are secured fire resisting bricks liormed in a rounded shape.

'lhe iron of the part l5 is correspondingly shaped except at its center tor the passage of the bricks to the right and left. This arrangement enables the use of very short bricks and prevents any broken bricks from falling out. The parts 15 are connected and hinged together by hinges, and they have for this purpose hinged links 17 and 1S which are connected by shafts and are so shaped that the hinges serve the purpose of links of a chain and engage in the corresponding apertures arranged in the pcriphery of the drums 7 and 8 which act as sprocket Wheels.

In order to support the floor throughout. all the part comprised between thc drums, there are fixed movable chains bearing the knobs Q0 connected together by links 2l, the whole forming an endless chain on rollers which travels freely upon an upper guide rail :22 and a lower guide rail 23. The parts 15 of the moving floor are provided at their ends with pieces 24 which engage with the knobs 20 of the moving track. At each side of the moving floor is placed such a moving track to support the upper edge of the moving floor and another' movable chain to support the lower edge. rfhe parts 24 are shaped soas to fit below upon the knobs 20 as regards the upper floor, and in like manner the same parts 24 rest upon the knobs 2O by means of their heads when they form the lower floor. By this combination a movement or' great smoothness is realized.

In order to keep the moving iioor perfectly stretched between the drums in spite of the differences of length due to the dilatation, use is made of a tension device for the floor for taking it up, according to which one of the drum shafts is mounted in counterneighted bearings, so as to be 1novable up or doivn under the diiiering strains. Figs. 6 and 7 illustrate this arrangement. The shaft 9-01c the front drum 7 is supported in bearings l1 which form slides With friction Wheels 30, 31 and capable of moving on a chair or a fixed frame 32 under the inlluence oi the traction of a balanced counteriveight suspended from a chain 33 which passes over the pulley 34 and is connected at 35 to the chair or movable bearing 11. By this arrangement, when the floor eX- pands or contracts, the counterweight compensates for the motion. The extent of these motions is of course not very great. Nevertheless, it is essential to provide a compensating mechanism which insures the constant uniform action of the drum at all times in spite of these movements; Jr'or thisy these casters are carried freely in slides 43 and this arrangement allows the movement 45 of the plates on the rails to take place with a minimum pushing or pulling effort in spite of the heat.

rll`he Hoor and the roof of the baking oven are sloped from the front towardl the rear at an angle of 2 degrees to assistiinxl retaining the Water vapor when the ov/en" is Working. The loaves to be baked are introduced through the opening 45and slide upon the guiding slope 46. They are thus placed upon the floor which carries them from one end of the baking chamber to the other up to the discharge opening 47. The bread When properly baked is given up by the moving iioor and caused to pass out by means of an endless moving band 48 driven by rollers at a speed considerably greater than that of the floor of the oven.

ln a bakers oven having almovable floor composed lor' fire-resistant plates in metal Jframes hinged together to form an endless chain; a pair of drums one of which is operatively connected with a source of rotary motion, recesses in said drums adapted to engage projections on the Hoor-hinges, movable chains adapted to support each side of the movable ioor, rotatable Wheels on said chains and fixed guide rails adapted to support said wheels, the Whole so arranged as to support the moving floor at its outer edges throughout its entire course.

in testimony whereof ive have signed our names to thespecication in the presence of two subscribed Witnesses.

LOUIS FERDINAND ALPHONSE DRUT. GEQRGES LARRBURU.

`Witnesses PAUL CAQUET, Lucian' MEMMINGER. 

